JP2952684B2 - Rotary bearing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rotary bearing, and more particularly to a rotary bearing in which the inclination of an arm generated by an eccentric load is apparently improved.

(Prior Art) A rotary bearing which receives a vertical shaft provided at one end of a horizontal arm and rotates the horizontal arm about the vertical axis has a structure as shown in FIG. In FIG. 1, reference numeral 1 denotes a support column provided with an upper rotary bearing 2 at an upper portion and a lower rotary bearing 3 at a lower portion to support a rotary shaft 4 inserted into the upper rotary bearing 2 and the lower rotary bearing 3. An arm 5 is mounted on the upper part of the rotating shaft 4, and a heavy object 6 is placed on the end of the arm 5, and the upper rotating bearing 2 and the lower rotating bearing 3 around the rotation center 7 by the rotating shaft 4.
It is supported by and rotates.

(Problems to be Solved by the Invention) By the way, in the case of an eccentric load in which the heavy object 6 is heavy and the heavy object 6 is placed only on one end of the arm 5, the arm 5 is bent and the bent arm 5 is rotated. Sometimes the plane of rotation of the weight 6 cannot be kept horizontal.

Conventionally, a method as shown in FIG. 9 is employed to rotate the weight 6 while holding the surface of the weight 6 in a horizontal plane. In the figure, the same parts as those in FIG. 8 are denoted by the same reference numerals. As is clear from the figure, when the arm 5 is attached to the rotating shaft 4, the arm 5 is attached diagonally in consideration of only the amount of bending of the arm 5, and the heavy object 6 maintains a horizontal posture when rotated. It is. This method has the following problems.

(A) Processing is troublesome.

(B) When the weight of the heavy object changes, the inclination changes, and all the heavy objects cannot be kept horizontal.

The present invention has been made in view of the above point, and an object of the present invention is to realize a rotary bearing that can maintain a horizontal posture in rotation due to an eccentric load even when an eccentric load is applied.

(Means for Solving the Problems) The present invention for solving the above problems is a rotary bearing that supports a rotary shaft to which an arm on which a heavy object is mounted is attached and rotates the heavy object without tilting, A support column having an upper bearing mounting hole for inserting an upper rotating bearing for holding a rotating shaft at an upper portion, and a lower bearing mounting hole for inserting a lower rotating bearing for holding a lower portion of the rotating portion at a lower portion, An upper bearing support plate, which is the upper rotary bearing inserted into the upper bearing mounting hole of the support column, an upper self-aligning bearing rotatably mounted on the upper bearing support plate, and the upper self-aligning bearing inserted into the lower bearing mounting hole of the support column. A lower bearing support plate serving as a lower rotary bearing, a lower self-aligning bearing rotatably mounted on the lower bearing support plate, and the rotary shaft inserted according to the weight of the heavy object fitted into the hollow portion of the lower self-aligning bearing; Rotating shaft insertion And an adjusting block provided with an eccentric entrance hole.

(Effect) The lower part of the rotating shaft mounted at right angles to the arm is eccentric, the rotating shaft is tilted and held, and the upper part is held by a 360 ° rotatable self-aligning bearing to reduce the amount of bending of the arm. Absorbed by the inclination of the rotating shaft, the heavy object placed on the arm is rotated while being kept horizontal.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a structural view of a rotary bearing according to one embodiment of the present invention, showing a state of connection with an arm. In the figure, the same parts as those in FIG. 8 are denoted by the same reference numerals.
In the figure, reference numeral 11 denotes an upper self-aligning bearing rotatable over 360 °, which is provided in place of the conventional upper rotary bearing 2 and is rotatably held by an upper bearing support plate 12, and is mounted on an upper bearing support plate 1. Hole
Inserted at 17. Reference numeral 13 denotes a rotating shaft which is attached to the end of the arm 5 and whose lower portion is formed into a stepped cylindrical shape thinner than the upper portion, which differs from the above in that the rotating shaft 4 is a cylindrical shape having the same diameter. I have. Reference numeral 14 denotes a lower centering bearing rotatably held in the lower bearing support plate 15 over a range of 360 °, which is mounted on the lower bearing support plate 15 and fitted into a lower bearing mounting hole 18 of the support column 1. I have. Lower self-aligning bearing 14
An adjustment block 16 is inserted into the hollow portion of the control device.

Here, the self-aligning bearings 11 and 14, the adjustment block 16,
The schematic structure of the rotating shaft 13, the arm 5, and the support column 1
This will be described with reference to FIG. 3, FIG. 3, FIG. 4 and FIG. FIG. 2 is a schematic structural view of the upper self-aligning bearing 11, in which FIG. 2A is a plan view and FIG. As shown in the figure, the upper bearing support plate 12 rotates the upper self-aligning bearing 11 having a columnar shape having a trapezoidal cross section whose lower portion is smaller than that of the upper portion, and a shape obtained by cutting the top and bottom of the sphere at the center. It is freely held. A rotation shaft insertion hole 21 for inserting the rotation shaft 13 is provided at the center of the upper self-aligning bearing 11, and the inserted rotation shaft 13 can be held in an inclined state. The lower self-aligning bearing 12 has a similar structure.

FIG. 3 is a structural diagram of the adjustment block. In the figures, (a) is a front view, and (b) is a plan view. In the drawing, reference numeral 22 denotes a rotary shaft insertion hole into which the lower portion of the rotary shaft 13 is inserted, which is provided eccentrically with respect to the outer periphery of the adjustment block 16. Reference numeral 23 denotes a fixing screw hole for attaching a set screw for fixing the rotating shaft 13 inserted into the rotating shaft insertion hole 22.

FIG. 4 shows an arm 5 and a rotating shaft attached thereto.
13 is a structural view of FIG. In the figure, (a) is a front view,
(B) The figure is a bottom view. The arm 5 and the rotating shaft 13 are mounted at right angles. The tip of the rotating shaft 13 has a smaller diameter than the root.

FIG. 5 is a structural view of the support column 1, and FIG.
FIG. 2B is a sectional view taken along line AA of FIG. In the figure, the same parts as those in FIG. 1 are denoted by the same reference numerals. The upper bearing support plate 12 is inserted into the upper bearing mounting hole 17, and the lower bearing support plate 15 is inserted into the lower bearing mounting hole 18.

Next, the operation of the rotary bearing shown in FIG. 1 will be described. The upper bearing support plate 12 on which the upper self-aligning bearing 11 is mounted is inserted into the upper bearing mounting hole 17 of the support column 1. Further, the lower bearing support plate 15 having the lower self-aligning bearing 14 attached thereto is inserted into the lower bearing mounting hole 18 of the support column 1. Although this fixing method is not shown, it is performed by an appropriate method such as screwing. After the upper bearing support plate 12 and the lower bearing support plate 15 are attached, the rotating shaft 13 is inserted into the rotating shaft insertion hole 21 of the upper self-aligning bearing 11, and the tip of the rotating shaft 13 is further self-aligned in the lower portion. The adjustment block 16 inserted into the bearing 11 is fitted into the rotation shaft insertion hole 22. When the rotating shaft 13 is inserted in this manner, the rotating shaft insertion hole of the adjustment block 16 is formed.
22 is provided eccentrically, so that the rotating shaft 13 is
The rotating shaft 13 is eccentrically rotated about the center of rotation 7 to compensate for the bending of the arm 5 on which the heavy object 6 is placed, and to horizontally move the heavy object 6 at the tip of the arm 5. To keep. The amount of inclination of the rotating shaft 13 can be adjusted by the amount of eccentricity of the rotating shaft insertion hole 22 in the adjusting block 16. Therefore, the adjusting block 16 having an eccentric amount suitable for the weight of the heavy object 6 can be prepared. If it is always heavy 6
Can be kept in a horizontal position.

FIG. 6 is a diagram showing a state in which the arm 5 on which the heavy object 6 is placed is rotated by using the rotary bearing of the present embodiment. FIG. 6A shows a case where the arm 5 is at the left position in FIG. (B) The figure shows a case where the arm 5 is on the right side. In the figure, the same parts as those in FIG. 1 are denoted by the same reference numerals. As is apparent from the figure, the upper self-aligning bearing 11 and the lower self-aligning bearing 14 are mounted on the upper and lower sides of the support column 1 and the arm 5 is formed by using the adjusting block 16 having the eccentric rotary shaft insertion hole 22. Even if it rotates, the heavy object 6 can always rotate horizontally.

The present invention is not limited to the above embodiment.
FIG. 7 shows a structural diagram of another embodiment of the present invention. In the figure, the same parts as those in FIGS. 1 and 8 are denoted by the same reference numerals. The rotary bearing of the present embodiment uses a conventional lower rotary bearing 3 in place of the rotary bearing composed of the lower bearing support plate 15 and the lower self-aligning bearing 14, and has at least the tip of the rotary shaft 13 attached to the arm 5. Two bolts 30 are attached so that the rotating shaft 13 is inclined. In this manner, the adjustment block 16 may not be used, and the inclination of the rotating shaft 13 can be changed by changing the screwing amount of the bolt 30.

(Effect of the Invention) By using a simple processing method and parts, the inclination of the arm due to the unbalanced load is adjusted, and the heavy object can always be kept horizontal. Further, even if the weight of the heavy object changes, it can be easily changed.

[Brief description of the drawings]

1 is a structural view of one embodiment of the present invention, FIG. 2 is a structural view of a rotary bearing used in the embodiment of FIG. 1, FIG. 3 is a structural view of an adjusting block, and FIG. FIG. 5 is a structural view of a support column, FIG. 6 is an explanatory view of the embodiment of FIG. 1 during operation, FIG. 7 is a structural view of another embodiment of the present invention, FIG. FIG. 9 is an explanatory view of a posture by a conventional rotary bearing. FIG. 9 is a view of a method of moving a heavy object horizontally using a conventional rotary bearing. DESCRIPTION OF SYMBOLS 1 ... Support pillar, 5 ... Arm 6 ... Heavy object, 11 ... Upper self-aligning bearing 12 ... Upper bearing support plate, 13 ... Rotating shaft 14 ... Lower self-aligning bearing, 15 ... Lower Bearing support plate 16 Adjustment block 17 Upper bearing mounting hole 18 Lower bearing mounting hole 21,22 Rotating shaft insertion hole 30 Bolt

Claims (2)

(57) [Claims] 1. A rotating bearing device for supporting a rotating shaft (13) to which an arm (5) on which a heavy object (6) is mounted is mounted and rotating the heavy object (6) without tilting the rotating shaft (13). The upper bearing has an upper bearing mounting hole (17) for inserting the upper rotary bearing for holding the rotary shaft (13), and the lower bearing for inserting the lower rotary bearing for holding the lower portion of the rotary shaft (13) in the lower portion A support column (1) having a mounting hole (18), an upper bearing support plate (12), which is the upper rotary bearing inserted into the upper bearing mounting hole (17) of the support column (1), and rotatably mounted thereon; The mounted upper self-aligning bearing (11), the lower bearing support plate (15) as the lower rotary bearing inserted into the lower bearing mounting hole (18) of the support column (1), and rotatably mounted thereon. The lower self-aligning bearing (14) and the hollow of the lower self-aligning bearing (14) Filled-in the heavy (6) weight eccentrically rotating shaft insertion hole (22) for inserting the rotating shaft (13) in accordance with of the adjustment block provided (1
6) A rotary bearing device comprising: 2. A rotary bearing device for supporting a rotating shaft (13) to which an arm (5) on which a heavy object (6) is placed is mounted and rotating the heavy object (6) without tilting the upper part. It has an upper bearing mounting hole (17) for inserting an upper rotary bearing for holding the rotary shaft (13), and a lower rotary bearing (3) for holding the lower portion of the rotary shaft (13) below. A support column (1) having a lower bearing mounting hole (18), and an upper bearing support plate (12), which is the upper rotary bearing inserted into the upper bearing mounting hole (17) of the support column (1); An upper self-aligning bearing (11) rotatably mounted, the lower rotary bearing (3) inserted into a lower bearing mounting hole (18) of the support column (1), and the rotary shaft (13). At least one bolt (30) fixed to the lower rotating bearing (3), wherein the rotating shaft (13) is Rolling bearings (3) to the at least one bolt (30) by a rotary bearing apparatus characterized in that it is fixed in an inclined state according to the weight of the heavy (6).